Quote:
Originally Posted by murphymad
There is the hidden resistor which is made up from a couple of loops of winding wire in a specific place.
Mike...
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Mike can you indicate where the 'hidden resistor' is located in the various winding sections? Given it is made from 'loops' of winding wire then that suggests it may be acting in a way as to balance primary half-winding leakage inductances (if located in a primary winding section), or even possibly a small inductance in the feedback secondary winding that carries secondary current and acts as a way to add some phase advance at very high frequency for stability.
BTW, the 1961 Crowhurst book "High Fidelity Sound Engineering" is available on-line (just google search for it) and interesting to note how Crowhurst has summarised the preceding decade of knowledge on certain matters.